Add --add-comments=TRANSLATORS to xgettext call by default.
Add --add-comments=TRANSLATORS to xgettext call by default.

This helps with the common case of prefixing comments with TRANSLATORS;
if that's not suitable, people can always change it.

babycaseny/poedit,alexhenrie/poedit,nawawi/poedit,nawawi/poedit,dwaynebailey/poedit,vslavik/poedit,egoitzro/poedit,nawawi/poedit,PatidarWeb/poedit,alexhenrie/poedit,vslavik/poedit,PatidarWeb/poedit,PKRoma/poedit,huoxudong125/poedit,c72578/poedit,nawawi/poedit,PKRoma/poedit,c72578/poedit,alexhenrie/poedit,c72578/poedit,BenKeyFSI/poedit,dwaynebailey/poedit,c72578/poedit,PatidarWeb/poedit,alexhenrie/poedit,huoxudong125/poedit,alexhenrie/poedit,babycaseny/poedit,dwaynebailey/poedit,babycaseny/poedit,nawawi/poedit,PatidarWeb/poedit,BenKeyFSI/poedit,babycaseny/poedit,dwaynebailey/poedit,huoxudong125/poedit,PKRoma/poedit,BenKeyFSI/poedit,egoitzro/poedit,huoxudong125/poedit,BenKeyFSI/poedit,vslavik/poedit,vslavik/poedit,dwaynebailey/poedit,BenKeyFSI/poedit,PatidarWeb/poedit,egoitzro/poedit,egoitzro/poedit,babycaseny/poedit,egoitzro/poedit,huoxudong125/poedit,PKRoma/poedit,vslavik/poedit,PKRoma/poedit,c72578/poedit